42 
Exceptional .—Koch describes a genus Endeis , with six-jointed an¬ 
tenna, the first three joints very short, the fourth as long as these 
three. His figures show the three short basal joints, the long fourth 
and a fifth, but no sixth joint. 
Remarks .—Passerini introduces into the first sub-family (Aphidime) 
as will be seen by reference to his synopsis already given, the fol¬ 
lowing genera which are omitted, viz: Cladobius and Pterocalli So 
far as I can see there, is no good reason why the species of Kochs 
Cladobius might not be placed in Aphis . . 
The species placed in Pterocallis may as well be m 6 alhpterus 
where Koch has placed them, and if a part of this group is brought 
into the tribe Aphidini all belonging to that genus should go with 
them. Callipterus evidently forms an osculent group between Aphidini 
and Laclmini, and I. am of the opinion that, it would be more m ac¬ 
cordance with natural grouping to place it in the former than the lat¬ 
ter. As Trama and Paracletus contain only apterous root-feeding species 
I have removed them to Rhizobiince. 
In Lachnini, I have omitted Pterochlorus as I consider the long legs 
of the species for which it was founded insufficient to remove it from 
Callipterus where it belongs. If removed it should be placed m Koch s 
genus JJryobius. n 
I have adopted Passerines generic name Aplonenra , tor the l em- 
phiginae with horizontal wings ,—Thelaxes cannot be used here as it is 
described as having the third discoidal vein once forked. 
Bnekton, who has so far given to the public only his arrangement 
of the genera of Aphidinae , introduces between Rhopalosiphum and 
Siphocoryne a new genus ,—Melanoxanthus, and next to Chaitophorus 
another genus Cryptosiphum. 
I have not seen the description of these genera and hence cannot 
assign them positions in the table. Koch gives several genera which 
1 have omitted as unnecessary and as not sufficiently distinct nom 
other mm era. Amphorophora Buckton is omitted as being without 
any real distinguishing characters. I am inclined to think it this genus 
was made to include the species of Megoura , making the form 
and length of the honey-tubes the chief character, it would be more 
natural and satisfactory rlian as they now stand. 
A list of genera, with the names of North American species which 
may be considered as typical: 
Genera. 
Siphonophora, Koch. 
Phorodon, Pass. 
Myzus, Pass. 
Hyalopterus, Koch. 
Drepanosiphum, Koch. 
Megoura, Buck. 
Rhopalosiphum, Koch. 
Toxoptera; Koch. 
Siphocoryne, Pass. 
Aphis, Linn. 
Chaitophorus, Koch. 
Typical species. 
Aphis rosae, Linn. 
Apb is humuli, Schrk. 
Aphis cerasi, Fabr. 
Aphis pruni, Fabr. 
Megoura solani, Thos. 
Aphis persiege, Sulz. 
Aphis mali, Fabr. 
Chaitophorus populicola, Thos. 
